Question

What are the limitations of Phase rule?

Answer 1

The limitations of phase rule are as follows:
1. It can be applied to system in equilibrium. It is not of much help when system attain equilibrium very slowly.

2. It applies only to single equilibrium state. It does not indicate other possible equilibrium in the system.

3. Phase rule consider only the number of phase ,but not their quantities .Even a minute quantity of phases when present accounts towards number of phases.

4. All phases must be present under the same condition of the temperature, pressure and gravitational forces.

Solid and liquid phases must not be in finely-divided state, otherwise deviations occur